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When Dr. Frank Bryant (Sir Michael Caine) is drunk in the lecture hall, he says "Not many people know that." This was an in-joke for a catchphrase initiated by Peter Sellers when he appeared on BBC's Parkinson show on October 28, 1972, where he did a Sir Michael Caine impression, in which he claimed that Caine had a habit of always quoting from the Guinness Book of Records and saying things like "Did you know that it takes a man in a tweed suit five and a half seconds to fall from the top of Big Ben to the ground? Now there's not many people know that!" This quickly became a catchphrase often repeated by many other impersonators when imitating Caine. "Not many people know that" is also the title of a best-selling collection of trivia anecdotes which Caine compiled in 1984 for a book for the charity the National Playing Fields Association.
This movie inspired many marriage break-ups according to Dame Julie Walters (Rita). While receiving the Award for Outstanding Contribution to British Film at the Moet British Independent Film Awards in 2013, Walters said: "I get people who come up to me and say 'I left my husband because of you, because of that film', or 'I got an education'. So many."
Sir Michael Caine was extremely impressed with Dame Julie Walters' performance because, even though Walters had never acted in a movie before, he thought she was a born natural.
Sir Michael Caine has said that knew he wouldn't win the Academy Award for Best Actor as soon as he saw that he was seated away from the front row at the ceremony. He was still given a standing ovation afterward anyway.